EP0323358B1 - Dispositif pour la fixation de deux éléments à l'aide d'un joint intercalaire écrasé sous forte pression - Google Patents

Dispositif pour la fixation de deux éléments à l'aide d'un joint intercalaire écrasé sous forte pression Download PDF

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Publication number
EP0323358B1
EP0323358B1 EP19880403359 EP88403359A EP0323358B1 EP 0323358 B1 EP0323358 B1 EP 0323358B1 EP 19880403359 EP19880403359 EP 19880403359 EP 88403359 A EP88403359 A EP 88403359A EP 0323358 B1 EP0323358 B1 EP 0323358B1
Authority
EP
European Patent Office
Prior art keywords
layer
seal
aluminium
elements
attachment surface
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP19880403359
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0323358A1 (fr
Inventor
Bernard Poussard
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Thales Avionics SAS
Original Assignee
Thales Avionics SAS
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Filing date
Publication date
Application filed by Thales Avionics SAS filed Critical Thales Avionics SAS
Publication of EP0323358A1 publication Critical patent/EP0323358A1/fr
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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
    • G01C19/00—Gyroscopes; Turn-sensitive devices using vibrating masses; Turn-sensitive devices without moving masses; Measuring angular rate using gyroscopic effects
    • G01C19/58—Turn-sensitive devices without moving masses
    • G01C19/64—Gyrometers using the Sagnac effect, i.e. rotation-induced shifts between counter-rotating electromagnetic beams
    • G01C19/66—Ring laser gyrometers
    • G01C19/661—Ring laser gyrometers details
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
    • B23K20/16—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating with interposition of special material to facilitate connection of the parts, e.g. material for absorbing or producing gas
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
    • H01S3/08—Construction or shape of optical resonators or components thereof
    • H01S3/081—Construction or shape of optical resonators or components thereof comprising three or more reflectors
    • H01S3/083—Ring lasers

Definitions

  • the present invention relates to a device for fixing two elements using an intermediate seal, the two elements and the intermediate seal being brought to high temperature then, the intermediate seal being crushed under high pressure.
  • gas lasers and gyrolasers most often comprise an envelope of insulating material containing gas, optical elements and at least two electrodes, namely: an anode, between which an electric current can be passed to effect a population inversion in the gas contained in the envelope. They frequently have accessory orifices closed by closure parts.
  • gyrolasers pose more difficult problems to solve than those encountered on other types of gas lasers. This is why the description and description of the invention which will follow will mainly relate to gyrolasers, although the solutions proposed obviously apply to all gas lasers and also to all connections between several materials requiring good qualities. '' tightness and mechanical or temperature resistance.
  • the electrodes and the closing parts of gyrolasers most often comprise a circular collar, fixed to the material which constitutes the envelope of said gyrolasers, by an attached seal.
  • the material constituting the envelope is generally a partially vitrified ceramic of the "zerodur" type, and the seal is generally made of indium or an indium alloy. It can also be made of aluminum, as described in patent application EP-A2-0153232 from the company Quantel.
  • the indium gasket can be crushed, either cold or hot, or brazed for the fixing operation on the optical unit.
  • the aluminum seal is generally crushed or compressed after prior heating to a temperature close to that of its melting point.
  • the electrodes and the closing pieces fixed by indium-based seals have the drawback of not withstanding high temperatures and consequently limit the field of use of the gyrolasers which use them.
  • the invention aims to produce gyrolaser electrodes, cathodes and anodes, as well as closure parts, which support high temperature operations, and can be fixed to the optical units very quickly without require a specific environment during the fixing operation.
  • the invention relates more generally to a device for fixing two elements using an intermediate seal crushed under high pressure between these two elements, the zone for fixing at least one of said elements with said seal being previously covered with a layer of a material of the same kind as the seal.
  • cathodes and anodes constitute the electrodes of the laser gyro and are connected to the conduits 2 by connection conduits 6.
  • the optical unit 1 is filled with a gaseous mixture generally based on helium and neon.
  • a gaseous mixture generally based on helium and neon.
  • An electric current passing between the electrodes excites this gas mixture and creates a plasma in the connection conduits 6 and in the conduits 2, plasma which, by amplifying the light, generates the laser effect.
  • an anode 7 generally consists of a flat disc or flange 8, of conductive material, one face 9 of which is used for fixing to the optical unit, and the other of which face 22 is used to apply pressure.
  • disc comprises a cylindrical portion 10 and a part 11, generally in the form of a rod, constituting the active part of the electrode, made of conductive material, for example tungsten.
  • This anode is fixed to the optical unit 1, at a place where a connection conduit 6 has been pierced, by a seal 12 made of a material such as aluminum, compressed to a temperature close to that of the melting of said material, seal placed between the face 9 of the flange 8 and the optical unit 1.
  • FIG. 3 illustrates the constitution of a cathode 13 according to the prior art, produced from an envelope 14 made of conductive material, of generally cylindro-spherical shape and provided with a collar 15, one face 16 of which serves to attachment to the optical unit 1, also using a hot-pressed seal 17, the other face 25 of which is used to apply pressure.
  • an anode produced according to the invention can be constituted in the same way as above, but the face 9 of the collar 8 is protected by a layer 20 of a stainless material or of which the oxide, if this material is oxidizable, can combine favorably with the material constituting the joint, or will be driven out at the time of compression.
  • This material is preferably aluminum. In this case, during the heating preceding the fixing, a thin layer of alumina will appear.
  • anodes according to the invention are fixed to the optical units by following an appropriate operating mode, for example:
  • FIG. 6 shows a cathode according to the invention, before the thermo-compression operation. Its constitution is similar to that of the cathode of Figure 3, but a layer 26, preferably of aluminum, has been previously deposited on the face 16 of the flange 15 of said cathode. A seal 27, also made of aluminum, is placed on the optical unit 1 and the cathode is placed on the seal. As with the anode, the assembly is heated to a temperature close to that of aluminum smelting, and high pressure is applied to the external face 25 of the flange 15.
  • the seal 27 is crushed, as in the case of the anode, and the alumina is also driven towards the edges 28 and 29 of the aluminum layer.
  • FIG. 9 shows this anode fixed on said optical unit 1 with its crushed seal and becoming one with the layer 35 material. Said layer 35, due to the fact that it projects over the cylindrical wall of the substrate, makes it possible to make an electrical connection between the exterior of the optical unit 1 and the emissive part 34 of the anode situated in front of the conduit 6 of said optical unit 1.
  • the protuberance 38 is intended to prevent the plasma, created between the electrodes, in the optical unit, from touching the material of the seal 21 and the protective layer 35.
  • FIG. 11 shows this anode fixed on the optical unit 1. Due to the protrusion 38, the tungsten layer 39 enters inside the conduit 6, and thus prevents the plasma from touching the seal 21 and the protective layer 35.
  • FIG. 12 shows an anode according to the invention performing a "queusot" function.
  • Figure 13 shows the anode of Figure 12 attached to the optical unit 1, and whose end 45 has been closed by a pinch 45 '.
  • the part of the layer 46 deposited on the end 41 of the tube 40 performs the anode function and the electrical connection is provided to the outside by the layer 48 if the collar 42 is made of insulating material.
  • FIG. 14 illustrates a second embodiment of the cathode according to the invention, in which the latter comprises, as for the first mode, an external envelope 14.
  • the internal surface of this envelope is covered with a layer of an emissive material 50, preferably aluminum, which forms the emissive part of said cathode, deposit which extends to the face 16 of the flange 15 and which covers it.
  • an emissive material 50 preferably aluminum
  • FIG. 15 shows this cathode fixed to the optical unit 1 by a crushed joint 27 and being one with the layer 50.
  • FIG. 16 illustrates a third embodiment of a cathode according to the invention.
  • FIG. 17 represents the cathode of FIG. 16 fixed on the optical unit 1 with the seal 27 crushed between said optical unit 1 and the aluminum layer 59.
  • FIG. 18 illustrates the method adopted for carrying out the operation of fixing the electrodes to the optical unit 1 and in particular for the prior heating of the metal parts.
  • the method is applied, by way of example, to an anode of the type of that presented in FIG. 8.
  • the heating is carried out by high frequency radiation created by a coil 60 placed around the pressure tool of the electrode to be fixed, so that the high frequency field heats the pressure tool which surrounds the electrodes.
  • the adjustment of the high frequency current, of the position of the winding 60 relative to the optical unit 1 and of the length of said winding 60 makes it possible to optimize the heating time and the distribution of temperatures between the rooms.
  • a piece 61 comes to apply pressure on the electrode to crush the seal.
  • closure parts by using a substrate such as those of the anodes of FIG. 8, and by applying a layer preferably in aluminum before fixing it on the optical unit using a seal, also preferably in aluminum.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Electromagnetism (AREA)
  • Optics & Photonics (AREA)
  • Power Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Plasma & Fusion (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Gyroscopes (AREA)
  • Lasers (AREA)
  • Connection Of Batteries Or Terminals (AREA)
EP19880403359 1987-12-30 1988-12-29 Dispositif pour la fixation de deux éléments à l'aide d'un joint intercalaire écrasé sous forte pression Expired - Lifetime EP0323358B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8718349A FR2625536B1 (fr) 1987-12-30 1987-12-30 Dispositif pour la fixation de deux elements a l'aide d'un joint intercalaire ecrase sous forte pression
FR8718349 1987-12-30

Publications (2)

Publication Number Publication Date
EP0323358A1 EP0323358A1 (fr) 1989-07-05
EP0323358B1 true EP0323358B1 (fr) 1992-07-01

Family

ID=9358423

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19880403359 Expired - Lifetime EP0323358B1 (fr) 1987-12-30 1988-12-29 Dispositif pour la fixation de deux éléments à l'aide d'un joint intercalaire écrasé sous forte pression

Country Status (4)

Country Link
EP (1) EP0323358B1 (es)
DE (1) DE3872504T2 (es)
ES (1) ES2033458T3 (es)
FR (1) FR2625536B1 (es)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2991767B1 (fr) * 2012-06-08 2015-06-19 Thales Sa Gyrolaser comprenant un dispositif de protection contre la corrosion
FR3013158B1 (fr) 2013-11-08 2017-05-26 Thales Sa Electrode de materiau metallique, et gyrolaser comprenant au moins une telle electrode
FR3053169B1 (fr) 2016-06-28 2018-08-10 Thales Dispositif de generation d'un rayonnement laser et procede de fabrication associe

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3203083A (en) * 1961-02-08 1965-08-31 Texas Instruments Inc Method of manufacturing a hermetically sealed semiconductor capsule
JPS5527865A (en) * 1978-08-18 1980-02-28 Toyota Motor Co Ltd Joint of ceramic member and manufacture of oxygen senser element
FR2399300A1 (fr) * 1979-02-01 1979-03-02 Labo Cent Telecommunicat Procede de formation a froid de soudures etanches entre pieces metalliques et application dudit procede aux tubes electroniques
GB2061155B (en) * 1979-10-11 1983-02-23 Secr Defence Pressure-bonding metal and/or ceramic members by using an interposed silver foil
FR2559474B1 (fr) * 1984-02-15 1988-12-23 Quantel Sa Procede de scellement etanche et etuvable d'objets metalliques sur un corps en materiau vitroceramique

Also Published As

Publication number Publication date
FR2625536B1 (fr) 1990-07-27
DE3872504T2 (de) 1993-01-28
DE3872504D1 (de) 1992-08-06
FR2625536A1 (fr) 1989-07-07
EP0323358A1 (fr) 1989-07-05
ES2033458T3 (es) 1993-03-16

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